USA Major League Soccer

SA Major League Soccer is a mens professional soccer league, sanctioned by U.S. Soccer, that represents the sports highest level in both the United States and Canada. The league is composed of 20 teams—17 in the U.S. and 3 in Canada. The MLS regular season runs from March to October, with each team playing 34 games; the team with the best record is awarded the Supporters Shield. The post season includes twelve teams competing in the MLS Cup Playoffs through November and December, culminating in the championship game, the MLS Cup. MLS teams also play in other domestic competitions against teams from other divisions in the U.S. Open Cup and in the Canadian Championship. MLS teams also compete against continental rivals in the CONCACAF Champions League.
MLSs 20 teams are divided between the Eastern and Western Conference. Each club is allowed up to 30 players on its first team roster. All 30 players are eligible for selection to each 18-player game-day squad during the regular season and playoffs.